C / C++ / MFC

Re: convert a CString to a char

29-May-02 7:15

use GetAt()

for example if CString temp="test"

out=temp.GetAt(3);

!! Put it in a if statement to prevent a asertation error:

if temp.GetLength()>2{ // e.g. 3
out=temp.GetAt(3);
}

Hope that helped.

An Expert is somone who has previously made ALL the Mistakes, I dream of this day. - Lucky

ed987129-May-02 7:17

ed9871

29-May-02 7:17

You can do it just like it was a char string.

CString m_sTest;
char c;

c = m_sTest[2];

You could also use the Mid function on the CString.

Ed

Re: convert a CString to a char

Martin Ziacek29-May-02 7:23

29-May-02 7:23

The Eclypse wrote:
Unless anyone know how to pick the 3rd character in on a CString

I think this could work:

CString str;

str = "123";

if (str[2] == '3') {
TRACE("Hey, you've got it!\n");
}

Read / Write Registry

Lucky the code machine29-May-02 7:08

29-May-02 7:08

Hiya,
Please halp me! I need some code to read & write registry keys in a particular place that already exists:

"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings"

above is the location and then i need to write a new key & read a key. DWord and Edit. Is there a simple way to do this?

Thank you for your time. Smile | :)

An Expert is somone who has previously made ALL the Mistakes, I dream of this day. - Lucky

Martin Ziacek29-May-02 7:19

29-May-02 7:19

There is CRegKey class in the VC++ 6.0 installation somewhere, it is easy to use.

Lucky the code machine29-May-02 7:17

29-May-02 7:17

I dont understand (Sory) How do i get at / read that?

An Expert is somone who has previously made ALL the Mistakes, I dream of this day. - Lucky

Martin Ziacek29-May-02 7:28

29-May-02 7:28

This is declaration of that class:

class CRegKey
{
public:
CRegKey();
~CRegKey();

// Attributes
public:
operator HKEY() const;
HKEY m_hKey;

// Operations
public:
LONG SetValue(DWORD dwValue, LPCTSTR lpszValueName);
LONG QueryValue(DWORD& dwValue, LPCTSTR lpszValueName);
LONG QueryValue(LPTSTR szValue, LPCTSTR lpszValueName, DWORD* pdwCount);
LONG QueryValue(BYTE *pbValue, LPCTSTR lpszValueName, DWORD* pdwCount);
LONG SetValue(LPCTSTR lpszValue, LPCTSTR lpszValueName = NULL);
LONG SetValue(BYTE *pbValue, DWORD dwLength, LPCTSTR lpszValueName = NULL);

LONG SetKeyValue(LPCTSTR lpszKeyName, LPCTSTR lpszValue, LPCTSTR lpszValueName = NULL);
static LONG WINAPI SetValue(HKEY hKeyParent, LPCTSTR lpszKeyName, LPCTSTR lpszValue, LPCTSTR lpszValueName = NULL);

LONG Create(HKEY hKeyParent, LPCTSTR lpszKeyName, LPTSTR lpszClass = REG_NONE, DWORD dwOptions = REG_OPTION_NON_VOLATILE, REGSAM samDesired = KEY_ALL_ACCESS, LPSECURITY_ATTRIBUTES lpSecAttr = NULL, LPDWORD lpdwDisposition = NULL);
LONG Open(HKEY hKeyParent, LPCTSTR lpszKeyName, REGSAM samDesired = KEY_ALL_ACCESS);
LONG Close();
HKEY Detach();
void Attach(HKEY hKey);
LONG DeleteSubKey(LPCTSTR lpszSubKey);
LONG RecurseDeleteKey(LPCTSTR lpszKey);
LONG DeleteValue(LPCTSTR lpszValue);
};

and you can do this:

CRegKey reg;

reg.Open(HKEY_CURRENT_USER,"Software\Microsoft\Windows\CurrentVersion\Internet Settings");

and then

reg.QueryValue(...); //to read value
reg.SetValue(...) //to write value

Lucky the code machine30-May-02 2:15

30-May-02 2:15

I hope im not being a pain. I tryed this and it worked fine:

char* text;
//unsigned long* buffer;
DWORD* buffer;
unsigned long PerServer;
unsigned long Per1_0Server;
CRegKey reg;

reg.Open(HKEY_CURRENT_USER,"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
reg.QueryValue(PerServer,"MaxConnectionsPerServer");

but when i try to read a string (the windows version name) with:

reg.Open(HKEY_LOCAL_MACHINE,"Software\\Microsoft\\Windows\\CurrentVersion");
reg.QueryValue(text,"ProductName",buffer);

i get an assertation error on the line "pdwCount!=null;" (in CRegKey) if i change buffer to anything using "buffer=(unsigned long*)999;" i dont get the error but i get no data.

Am i being stupid? I cant see where im going wrong.

An Expert is somone who has previously made ALL the Mistakes, I dream of this day. - Lucky

Martin Ziacek29-May-02 7:31

29-May-02 7:31

Lucky the code machine wrote:
Date:13:17 29 May '02

You had posted your answer to my message two minutes before I posted it. Confused | :confused:

Lucky the code machine29-May-02 7:29